Phone, use the SMS service or write, per the terms of your contract.
If you're in a fixed term contract you'll need to pay any ETF's
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Note that you have to give 30 days notice and if you are still in contract you will be subject to early termination fees
Call 150 from a VM phone or by dialling 0345 454 1111 from any phone - they are still picking up - calling at 08.00 is the best time to get through follow options 1,1,4,4
In writing to Virgin Media Sales Operation Support, Diamond Plaza, Daleside Road, Nottingham, Nottinghamshire, NG2 3GG. Include name address and all account details - send registered post with proof of arrival by signature (keep a copy of everything)
-------------------- John --------------------
My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.